Former Bruins d-man Jon Rohloff is the latest to file a concussion lawsuit against the NHL, per the New York Times.

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Rohloff, a defenseman for the Boston Bruins from 1994 to 1997, is the lone named plaintiff in the suit, which was filed in United States District Court in Minnesota. The suit says that the league concealed the dangers of concussion and did not pass rules designed to reduce the risk of brain injury until recent seasons. N.H.L. representatives did not respond to a request for comment late Tuesday afternoon.

After a similar suit was filed in April, Bill Daly, the deputy commissioner, said, “We are completely satisfied with our record on player safety, including as it relates to head injuries and brain trauma.”

This is the fourth concussion-related suit the NHL’s been hit with. The first came in November of 2013, when a group of 10 ex-players filed in a federal court in Washington. The second was filed in April — one that included former NHLers Dan LaCouture, Dan Keczmer and Mike Peluso, but one that also lost credibility by claiming NHL legend Gordie Howe died in 2009 from a neurodegenerative disease called Pick’s disease.

(Howe is still alive. It was his wife, Colleen, who died of the disease.)

The third suit was also filed in April, in Minneapolis, by retired players Dave Christian, Reed Larson and William Bennett.